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X

X15 Efficiency

A GHG designation for on-highway tractor applications optimized to achieve the best fuel efficiency.

X15 Performance

A GHG designation for X-Series engines optimized for multipurpose, vocational, and severe heavy-haul applications.

X15 Productivity

A GHG designation for X-Series engines optimized to produce the highest power output for vocational and on-highway tractor applications.